\usepackage{tikz}
\usetikzlibrary{shapes} % ellipse node shape
\usetikzlibrary{shapes.multipart} % for line breaks in node text
\usetikzlibrary{arrows.meta}    %-o arrow head
\usetikzlibrary{arrows}
\usetikzlibrary{matrix}

\usepackage{xeCJK}              
% \newtcolorbox{commentBox}[1][]{
%   tile,
%   bicolor,sidebyside,
%   righthand width=2cm,
%   colback=gray!20,
%   before lower={},
%   fontupper=\footnotesize,
%   left=0mm, #1}